Alan Woodward created LUCENE-9099:
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Summary: Correctly handle repeats in ordered and unordered
intervals
Key: LUCENE-9099
URL: https://issues.apache.org/jira/browse/LUCENE-9099
Project: Lucene - Core
Issue Type: Improvement
Reporter: Alan Woodward
Assignee: Alan Woodward
If you have repeating intervals in an ordered or unordered interval source, you
currently get somewhat confusing behaviour:
* ORDERED(a, a, b) will return an extra interval over just `a b` if it first
matches `a a b`, meaning that you can get incorrect results if used in a
CONTAINING filter - CONTAINING(ORDERED(x, y), ORDERED(a, a, b)) will match on
the document `a x a b y`
* UNORDERED(a, a) will match on documents that just containg a single `a`.
It is possible to deal with the unordered case when building sources by
rewriting duplicates to nested ORDERED clauses, so that UNORDERED(a, b, c, a,
b) becomes UNORDERED(ORDERED(a, a), ORDERED(b, b), c), but this then breaks
MAXGAPS filtering.
We should try and fix this within intervals themselves.
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